lytle



Patented Sept. 9, 1884.

III/

L/ l r 5 A. E. LYTLE..

EXPANDING WRENCH AND MANDEEL.

(No Model.)

UNITED, STA -es OFFICE.

' ALBERT E. LYTTIE, or CHICAGO, ILLINOIS, ASSIGSOR- or TWO-THIRDS TOJOHXlL-N'ANHOUSEX, BEACH 'r. vaxnonsnx, AND GEORGE H. EATON,

To all whom it may concern' work.

i ALL or sun: PLACE- t I EXPANDING WRENCH AND MANDRELQ SPECIFICATIONforming part of Letters Patent No. 305,035, dated September 9, 1884.

' v Application filed December 13(1893. (X0 model.) I I Be it known thatI, ALBERT 1-3. LYTLE, a citizenof the United States, residing at Chicagoin the county of Cook and State of Illinois, have invented certain newand useful Improvements in Erpanding \Vrenchcs and Mandrels, of whichthe following is a specification, to wit:

This invention relates to an improvement in inside wrenches andmandrels; and it consists in the peculiar construction and arrangementof the same, whereby a series of dogs having corrugated faces areexpanded evenly in all directions to hold the work, substan" tially aswill be hereinafter more fully set forth.

In order to enable others skilled in the art to which lnyinventionappertaius to makel and use the same, I will now proceed to del scribeits construction and operation. referringtotheaccompanying drawings, inwhich- I Figure 1 is a longitudinal section of my mandrel; Fig. 2,atransverse section of the same; Fig. 3, a side view of my wrench, andFig. 4 a longitudinal section, and Fig. 5, a transverse section of thesame, showing it clutching a bung-bushing.

A represents a steel shell or cylinder formed & hollow, as shown, andhaving one end open and the other closed, and provided with ascrew-threaded hole, a, as seen in Figs. 1 and 4. The shell A is'formedwith any suitable number-of slots, a, extending through its sideslongitudinally for a suitable distance, in each of which is placed adog, B, having acorrugated face, 11, and its rear or inner side formed.on an incline. or wedge-shaped, as at 6'. These dogs are prevented frompassing entirely through the shell by a small projecting flange, b, ateach end, which lies in a slot, (1, in the shell at the ends of the dog.

0 represents a plug, circular in cross-section, and tapering for asuitable distance upon the same angle given to the adjacent faces of thedogs. This plug or expander is provided with a sciew-thrcadcd point, 0,which passes through the threaded hole u in the end of the shell. Thedogs having been placed in position and the plug or expander inserted,it is only necessary to screw it in to expand the dogs cquallyin alldirections, and thus accommodate themselves to various sizes of In theform shown in Fig. 1 this device is especially valuable in lathe work,as it can be placed in the lathe and the cylinder to be turned clampedfirmly and properly centered at the same time, thus saving much time andwogk over the ordinary method of fitting a plug into the cylinder, andthen centering it for attachment to the lathe. The mandrel is usually"long enough to extend entirely through the object to be turned, and maythen be clamped between the centeis of the lathe and revolved by meansof a lathedog, as usual with similar-shaped tools; or it may be clampedat one end in a chuck, such as ordinarily used in lathes. The smallerform shown in Fig. 4 can be used to great advantage as an inside wrench,and is especially adapted to inserting and removing the bushiugs frombarrels.

It is obvious that the device may be made of any desired size for coarseor delicate work. Ihe plug or expander is formed on one end with anangular portion for the attachmentof a wrench, or a hole for using aspanner, and the shell may also be so formed, if desired, in order thatone may be firmly held while the other is turned.

I am aware that it is not new, broadly, to

construct a mandrel or wrench with expanding dogs. and do not desire tobe understood as claiming such as my invention.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, isg In an expanding wrench ormandreha shell or cylinder formed with longitudinal slots or openings inits sides hlwiug recesses at their ends, and a screw-threaded holethrough the end of the shell, in combination with a series of dogsserrated upon their outer and inclined upon their inner faces, andhaving projecting flanges on their ends, and a tapering screwthreadedplug or expander adapted to expand the dogs equally as it is passed intothe shell, substantially as and for the purpose set forth.

In testimony whereof I attix my signature in presence of two witnesses.

W. (J. MCARTHUR, (LS. Hannrsorw

